Unit 5 Into the wild Understanding ideas 课件(共24张PPT) 外研版(2019)必修第一册

(共24张PPT)
The Monarch’s
Journey
--2023.11.29
The text-type of the passage
Argumentation议论文 (如 “click for a friend ” )
Exposition说明文
Narration记叙文 (如 “my first day at seinior high” )
P68 Where are you most likely to find the passage
In a scientific research paper about the monarch butterfly’s migration.
In a popular nature magazine introducing the monarch butterfly.
In a travel leaflet encouraging people to visit North America.
The Monarch’s Journey
migration
what
why
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appearance
They are beautiful insects with fine black and orange wings.
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Find information about monarch’s migration
as much as you can.
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Every autumn, millions of monarch butterflies travel around 4,000 kilometres south, from North America to California or Mexico, to find food, seek a partner or be in search of warmer weather.
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Suppose you are a monarch butterfly. What dangers will you meet that may cause the death
A long and difficult journey
A long and difficult journey
How they make it
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“cause-effect” flow charts
The monarch butterfly is able to tell
1. _____________.
b. Using these two pieces of information, the monarch butterfly determines 2. ____________.
the time of day
the way to go
c. The monarch butterfly measures
3._____________________ with its eyes.
d. The monarch butterfly reaches
4. __________________________________.
the position of the sun
the places where it will spend the winter
d
a / c
c / a
b
A long and difficult journey
Who solved this mystery
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A long and difficult journey
When did they find the
solution
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until recently no one knew how they did this.
adv. 最近
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Q1: Is the number of the monarch butterfly becoming more or less Which words tell you that
Q3: How does human activity affect monarch’s number badly
Q2: The reason of its number’s falling
f. The ________________________________ where monarchs can be found is destroyed.
h. The monarch butterfly’s population _______________________________________ in the last few years.
g. Humans use chemicals that _____________ that monarch caterpillars eat.
e. Humans _________ trees.
cut down
kill the plants
natural environment of many places
has crashed by as much as 90 per cent
“cause-effect” flow chart
Q:What have people done to help the monarch butterfly
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i. The research has led to a greater ______ of this creature.
j. People work together to _______________________
k. Make sure that there are __________________________
l. There may come a time when its number_____________
awareness
record its migration
enough plants for it to feed on
increases once again
i
j
k
l
Translate翻译 the last sentence:
The more we know about this lovely creature,
the greater the chance it will survive and keep its place in the natural world for a long time to come.
我们对这种可爱的生物了解越多，
在未来长久的一段时间里，它们在自然界中得以生存并保持其位置的机会就越大。
the way to go
to do非谓语动词做后置定语
the great efforts努力 of
every single butterfly
to make its species物种
renew焕新、更新
continue
and
survive
the amazing process过程
from a caterpillar to
a beautiful butterfly
What does this journey mean to itself
After reading :
lead
（v.）
1.过去式 过去分词
2.
A group of scientists led by Porfessor Eli. --lead:领导
The research has let to a greater awareness of this creature. ---lead:导致
（n.）
in the lead 领先
1. at times
2. the solution to the mystery
3. the number of
4. the natural environment
9. translation(翻译)：
The caterpillar feeds on the plants.
Its population has crashed by as much as 90 per cent in the past few years.
帝王蝶能够识别一天的时间。它用自己的眼睛测量太阳的位置。
5. manage to
6. increase
7. once again
8. record
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